Electrical apparatus



, Jan. 11 1927 1,614,250

w. s. MOODY ELECTRICAL APPARATUS Filed June 2 8, 1921 0 0 Q 0 O Q 0 O OO Q Q Q Q 0 O Q 0 lnventor Walter- S.Mood y, y M4. W

H is Attorney.

Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

WALTER S. MOODY, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELEC-TRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL Application filed June 28,

My invention relates to electrical apparatus, and particularly to oilsubmerged electrical apparatus; and has for its object an improvedconstruction and arrangement of parts which is economical and readilymanufactured,

In oil submerged electrical apparatus, such as transformers, somereactors. oil switches and the like, it has been found that the airspace above the oil in the casing which houses the apparatus has manydisadvantages in addition to making the apparatus bulky and thereforeneedlessly expensive.

It accordingly has been proposed to eliminate the air space and fill thecasing entirely with oil and to take care of the expansion andcontraction of the oil content thereof by the provision of an auxiliarytank or casing, generally styled a conservator which is arranged tocommunicate with the main casing.

Such conservators, according to the best practice, are made not only tokeep the air away from the hot oil and thereby prevent sludging or rapidoxidization of the oil, but to collect and trap moisture; a special sumpbeing generally provided to this end as taught in the U. S. LettersPatent to Kulka No. 1,002,527.

It frequently becomes desirable to increase the capacity of such oilsubmerged electrical apparatus and still maintain them as selfcooledunits by suitably attaching to the casing one or more radiators orequivalent radiating units so as to decrease the normal temperature risewhen operating under load. These radiators must of course be in liquidcommunication with the oil content of the main casing at both top andbottom; otherwise there would be no circulation of the oil through theradiator to dissipate the heat engendered by the electrical apparatus.

According to the practice prior to my invention, these radiators werealways materially shorter in length than the height of the main easing.

In tanks equipped with conservators, ll take advantage of the fact thatthe casing is entirely filled with oil in practicing my invention, sinceI increase the length of radiators and arrange them to communicate withthe uppermost part of the cover of the easing, thereby getting a morerapid circulation of the oil and at the same time efiectu' APPARATUS.

1921. Serial No. 481,137.

ally increasing the radiating surface at substantially a minimum cost.

For a more complete understanding of the nature and objects of myinvention reference should be had} to the following eetailed descriptionwhen taken in connection with the accompanying drawing in which:

The figure shows in side elevation a trans former casing constructed inaccordance with my invention.

Referring now to the drawing, denotes a casing made preferably of boilerplate for an electrical apparatus, here assumed to be a transformer.such casing being provided with a removable cover 11 with a dependiugouter edge portion and an auxiliary casing 12 which is in liquidcommunication with and serves as an expansion chamber for the oilcontent of the main casing. This auxiliary casing is shown as supportedfrom the main casing by means of the supporting structure 1.3.

Insulating bushings for the leads to the transformer windings are shownat 14- and 15 respectively.

Radiating units for increasing the capacity of the apparatus rated as aself cooled unit are shown at 20. Each unit comprises headers 21. at thetop and bottom connected by tubular passages preferably of oval crosssection. The precise construction of these units is, however, no part.of my present invention which rcsidesrather in their manner ofapplication to conservator type casings.

These units have suliicient length to reach from substantially thebottom of the casing 10 to the top of the cover; communication at thepoints in the bottom being established by means of the elbow couplings22 leading to the bottom headers, communication with the cover 11. beingestablished through the elbow couplings 24 extending substantiallyhorizontally between the top headers and the flanged nipples 23 whichproject from the depending edge portion of the cover near the uppermostpart thereof.

The cost to make. the radiating units sufficiently long to connect withthe nipples in the cover 11 over that formerly employed to connect withsome point near the top of the side wall of the casing 10 iscomparatively small. On the other hand this small, additional costresults in a comparatively large increase in effective radiatng surface.

Having now described an embodiment. of

- my invention which is at present the best means known to me forcarrying: t'rw same into ell'ect, I would have it understood Ihat thisis merely illustrative, and that I do not mean to be limited thereby tothe precise details shown nor restrieted in the choice of recognizedequivalents except as defined in my claim hereunto annexed.

What I c aim as ne\ and desire to secure by Letters Patent of the UnitedStates, is:

A casing for electrical apparatus, said casing being provided with aremovable covet-having :1 depending outer edge portion, a plurality ofradiating units spz ced about said casing, each (lf-rfitlld radial ins,units coinnuini 'ating with said casing llittl' the bot tom thereol andhavng: a coni'leclion extending from its upper end substant'ullyhorizontally to said depending edge potuion oi the cover near itsuppermost part said ea.-:- ing and 'adiating units being completelyfilled with a liquid insulating medium and an auxiliary using in liquidcominuni "ation with and serving as an expansion chamber for said liquidinsulating med um,

in witness whereof, I have hereunto set my hand this 23rd day of June,i921.

